How to find circumference

Practice Questions

ACT Math › How to find circumference

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1

A circle has an area of . Using this information find the circumference of the circle.

2

Find the circumference of a circle with radius 6.

3

A circle with an area of 13_π_ in2 is centered at point C. What is the circumference of this circle?

4

A running track can be formed by adding a semicircle to each of the short ends of a rectangle of dimension .

If Tracy runs one lap around the track described above, how far has she run?

5

If a circle has an area of , what is the circumference of the circle?

6

A circle has the equation below. What is the circumference of the circle?

(x – 2)2 + (y + 3)2 = 9

7

What is the circumference of a cirle with a radius of seven?

Leave your answer in terms of .

8

What is the circumference of a circle with a radius of six ft? Leave your answer in terms of .

9

A 6 by 8 rectangle is inscribed in a circle. What is the circumference of the circle?

10

A car tire has a radius of 18 inches. When the tire has made 200 revolutions, how far has the car gone in feet?

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